TypeError: dokuwiki\MailUtils::obfuscate(): Argument #1 ($email) must be of type string, null given, called in /home/users/2/chicappa.jp-deepsky/web/wiki/inc/parser/xhtml.php on line 1161

An unforeseen error has occured. This is most likely a bug somewhere. It might be a problem in the dw2pdf plugin.

More info has been written to the DokuWiki error log.